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UPSC 1998: Assertion (A): The temperature of a metal wire rises when an electric current is passed through it. Reason (R): Collision of metal atoms with each other releases heat energy.
(a)Both A and R are true, and R is the correct explanation of A
(b)Both A and R are true, but R is NOT a correct explanation of A
(c)A is true, but R is false
(d)A is false, but R is true
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Not attemptedCorrect Answer: (c) A is true, but R is false
A metal wire heats up when current flows because drifting electrons collide with lattice ions, converting electrical energy into thermal energy (assertion true). The reason claims heat is released by metal atoms colliding with each other, which is incorrect, so R is false. ([licchavilyceum.com](https://licchavilyceum.com/upsc-civil-services-prelims-1998-solved-question-paper/))
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Frequently Asked Questions
What is the correct answer to this UPSC 1998 Science & Technology question?▼
The correct answer is option (c): A is true, but R is false. Watch the detailed video explanation in our Sherlocking Prelims course on UnlockIAS.
Which year was this Physics question asked in UPSC Prelims?▼
This question was asked in UPSC CSE Prelims 1998, GS Paper 1, as Question 128. It falls under Science & Technology > Physics.
What is the difficulty level of this UPSC question?▼
This question is rated "moderate". It requires sound conceptual understanding of the topic.
How many UPSC Prelims questions have been asked from Physics?▼
UPSC has asked 104 questions from Physics (under Science & Technology) across multiple years. Visit the topic page to see the full list and year-wise trends.